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Comp 222-Telecommunications And Computers Question Paper
Comp 222-Telecommunications And Computers
Course:Bachelor Of Computer Science (It Telecommunication)
Institution: Kabarak University question papers
Exam Year:2009
KABARAK UNIVERSITY
EXAMINATIONS
2009/2010 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF COMPUTER SCIENCE
COURSE CODE: COMP 222
COURSE TITLE: TELECOMMUNICATIONS AND
COMPUTERS
STREAM: Y2S2
DAY: TUESDAY
TIME: 2.00 – 4.00 P.M.
DATE: 01/12/2009
INSTRUCTIONS:
1. This question paper has FIVE questions
2. Answer question ONE and any other TWO question
QUESTION ONE (30 MARKS) COMPULSORY
(a) Explain the meaning of the following terms
i. Signal degradation
ii. multiplexing
iii. FTTP (6mks)
(b) Distinguish between the following
i. Synchronous and asynchronous mode
ii. A hub and repeater (4mks)
(c) Compare and contrast bus and ring network topologies (5mks)
(d) One of the advantages of a computer network is that it is more efficient. Discuss
the three ways that makes a computer network more efficient (6mks)
(a) Discuss Hosted PBX, IP-PBX and mobile PBX giving at least one advantage and
one disadvantage of each (6mks)
(e) Determine the time taken to download a 8kB document by a 128k modem if the
system has a system delay of 3 seconds (3mks)
QUESTION TWO (20 MARKS) ELECTIVE
(a) Explain the following terms as used in telecommunications
i. Through put
ii. Base band
iii. Packets (6mks)
(b) One of the factors affecting data transmission is its switching mode. Compare
and contrast circuit switching and packet switching modes (5mks)
(c) Discuss unicast, broadcast and multicast transmissions giving at least one
advantage and one disadvantage of each (9mks)
QUESTION THREE (20 MARKS) ELECTIVE
(a) What is meant by the term digital signal? (1mks)
(b) Why are digital signals preferred over analog signals in computer networks
(2mks)
(c) Distinguish between baseband and broad band bandwidths (2mks)
(d) Explain the terms bits, analog signal, baud rate and data transfer rate (8mks)
(e) The line below is a message sent over a network
Telephone networks are divided into two types: i. PSTN (Public Switched Telephone
Network) which is similar to the internet), ii. PBX (Private Branch Exchange), a
privately owned network.
if the message takes 0.5 milliseconds to be transmitted over the network, determine
i. the transfer rate in bps (4mks)
ii. baud in kbps (3mks)
QUESTION FOUR (20 MARKS) ELECTIVE
(a) What is network protocol stack? Give an example of a protocol stack (2mks)
(b) State six issues in networking that prompted International Standards Organization
to develop OSI reference model (3mks)
(c) Explain difference between the data link and network layers of the OSI reference
model layers (6mks)
(a) For each of the following protocols, write their names in full, outline their
functions and state the OSI reference model layer they operate
i. ICMP
ii. FTP
iii. HTTP (9mks)
QUESTION FIVE (20 MARKS) ELECTIVE
(a) What is the importance of MODEMs in communications? (2mks)
(b) MODEMs come in various forms and operate and wide speed ranges. Discuss
external and internal modems giving at least one advantage and one disadvantage
of each. (6mks)
(c) Apart modulating and demodulating signals modern modems can perform other
functions. State and explain six of these functions (6mks)
(d) In modulating of signals, a MODEM codes a binary digit 0 as compressions and a
binary digit 1 as rarefactions. Sketch an analog signal that results from the
following digital signal (6mks)
V(v)
t(s)
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